Combustible damper control for unit heaters



July 28, 1931. E T 1,816,217

COMBUSTIBLE DAMPER CONTROL FOR UNIT HEATERS Filed Aug. 29, 1929 s SheetS -Sheet 1 ATTORNEY July 28, 1931. D. HARNETT 7 1,816,217

COMBUST IBLE DAMPER CONTROL FOR UNIT HEATERS Filed Aug- 29, 1929 3 Sheets-Sheet' 2 -11v VENTOR A TTORNEY I l I, I I W 1 11 I r I 11 1111111 1 U COMBUSTIBLE DAMPER CONTROL FOR UNIT HEATERS INVENTOR gm $.W

A'TTORNE Y l ings.

Patented July 28, 1931 UNITED- STATES PATENT OFFICE LEWIS D. BARNETT, OF COIJII'MBIJSJ, OHIO,

BUCKEYE BLOWER COMPANY, A

ASSIGNOR, BY ii'insnn ASSIGNMENTS, 'ro CORPORATION or DELAWARE COMBUSTIBLE DAMPER CONTROL FOR UNIT HEATERS Application filed- August 29,

- is no means of closing this opening as required by fire codes so that the present requirements of codes for fire windows are largely nullified by these openings through the walls of buildings adjacent to otherbuild- It is the object of my invention to provide means independent of the normal operation of the air inlet damper for forcibly shutting it when the heat adjacent the air inlet open 20 ing exceeds a predetermined point as in case of fire. v

Refering to the drawings: Figure 1 is a vertical section viewed from the side of the unit heater and ventilator;

Figure 2 is an enlarged section adjacent the air inletopening in the bottom of the unit; Figure 3 is a detail elevation of the fusible link and closing apparatus for the damper;

Figure 4 is a side elevation thereof. Referring to the drawings, '1 is the usual casing for, a unit heater and ventilator having an air inlet'opening 2 communicating with a passageway 3 in the wall 4 from the outside area 5 on the outside of the building.

' 6 indicates the inside of a room within the building. A re-circulating opening 7 isprovided for re-circulating air from the room through the casing. A damper 8 pivoted at 9 is adapted to close either there-circulation opening 7 or the fresh air opening 2. The air thus admitted-passes upwardly through the filter 10, blower 11, over the radiator 12 or through the by-pass 13 depending upon the position of the dampers 14 and 15 and thence out through the air exit opening 16. Ordinaril the damper 8 is operated by the link 17- w ICh'iS pivoted to the damper. To this link is connected an arm 18 pivoted on the shaft 19. Onjthe shaft is a second arm 20 means to retain said damper in o mally inoperative,-

1929. Serial No. 389,165.

to which is connected the helical spring 21 that, in. turn, is connected to the bottom 22 of thecasing. This spring serves to hold the damper in either of its positions to which it may be moved either by hand or by any form of motive power.

The particular apparatus of my invention I is mounted upon the shaft. 19 and is constructed in the following manner. The shaft 19 is mounted in a bracket23to which is connected a very powerful helical spring 24, the free end of which is connected to a drum 25 that carries a sleeve 26 that is loosely. mounted upon the shaft 19. On this drum is wound a ca le 27, the free end of which is tied at 28 Where excessive heat will readily burn the cable. The drum 25 carri pin 29 which project 31 which is pinned b s a laterally extendin into a slot 30 of a dis the pin 32 to the shaft 19. When the cable urns, the spring 24 is released and is able to move the disk 25 and sleeve 26 freely and to acquire sufiicient momentum for the movement of the shaft 19 and the damper 8 when the pin 29 reaches the end of the slot 30 in the disk 31 which results in Y turning the shaft 19 and moving the damper 8 to the closed position. The strengthv of the spring 24; is suflicient to do this against the resistance of the spring 21. Thus, the inlet opening 2 is closed in case of fire and the building. is protected.

It will be understood that I desire to com-' prehend within my invention such modifications as may be necessary to adapt it to varying conditions and uses. Having thus fully described my invention,

what I claim as new and desire to securely Letters Patent, is

1. In combinatioma wall having'an open- *ing, a damper pivoted ad acent sa d opening.

for closing it normally in open position,

normally, means to close said and means out o with the damper affected by heat adjacent said opening for rendering said closing means with a wall havin an in en position 1 am er. nor-g contact damper pivotally mounted to close said opening, means normally tending to close said damper, and means out of contact with the damper to hold the damper closing means inoperative until the predetermined degree of heat has been attained adjacent said opening.

3. In combination, a unit heater and ventilator having an air inlet opening eooperating with an opening in a wall, a damper for closing said opening, means for normally maintaining said damper in open position, and means independent of pi'essure controlled by a predetermined degree of heat for closingsaid damper against the resistance of the means holding it open.

4. In combination, a unit heater and ventilator having an air inlet opening from the outside of the building and having a recirculation opening from the inside of the building, a common damper for alternately closing said openings, and means independent of pressure for closing said damper when a pre determined degree of heat has beenobtained adjacent the air inlet opening side of the building.

5. In combination, a unit heater and ventilator having an air inlet opening from the outside of the building and having a re-circulation opening from the inside of the building, a common damper for alternately closing said openings, and means independent of pressure for closingsaid damper against the inlet opening when a predetermined degree of heat has been obtained adjacent the air inlet opening side of the building, and means independent thereof for normally maintaining said damper in either open or closed p0- sition in the regular operation of the unit.

6. In combination in a unit heater and ventilator of an air inlet passageway comluunicating with the outside of the building, a damper for controlling said passageway, yielding means for maintaining said damper in either open or closed position, and supplementary emergency means adapted to close said damper in case of excessive heat adjacent the air inlet opening.

7. In combination in a unit heater and ventilator of an air inlet passageway communicating with the outside of the building, a damper for controlling said passageway, yielding means for maintaining said damper in either open or closed position, and supple mentary emergency means adapted to close said damper in case of excessive heat adjacent the air inlet opening, said means comprising yielding means powerful enough to close said damper, and means retaining said yielding means in inoperative condition adapted to be destroyed by excessive heat adjacent the inlet openin 8. In combination in a unit heater and ventilator of an air inlet passageway communicating with the outside of the building,

a damper for controlling said passageway, yielding means for maintaining said damper in either open or closed position, and supplementary emergency means adapted to close said damper in case of excessive heat adjacent the air inlet opening, said means comprising yielding means powerful gnough to close said damper, and means retaining said yielding means in inoperative condition adapted to be destroyed by excessive heat adjacent the inlet opening, such as a cord of textile material.

9. In combination :in a damper closing means of a damper, an operating shaft, lever means connecting said shaft and damper, a drum on said shaft, 21 cable on said drum connected to a remote point from the damper, and yielding means-for operating said drum and said shaft to close the damper.

10. In combination in a damper closing means of a damper, an operating shaft, lever means connecting said shaft and damper, a drum on said shaft, a cable on said drum connected to a remote point from the damper, yielding means for operating said drum and said shaft to close the damper, and means to permit a predetermined movement of said yielding means and drum with respect to the shaft before actuating it and the damper.

11. In combination, a damper, a shaft connected thereto, a disk on the shaft having a slot, a drum loosely mounted on said shaft adjacent the disk having a pin projecting into the slot thereof, yielding means connected to said drum at one end and to a stationary abutment at the other, and a cord wound on said drum attached to a remote point whereby when said cord is released the drum rotates under the influence of the yielding means until the pin strikes the end of the slot of the disk rotating the disk and the shaft and closing the damper.

In testimony whereof I afiix my signature.

LEWIS D. HARNETT. 

